Definition of parathion
: an extremely toxic insecticide C10H14NO5PS
Recent Examples of parathion from the Web
The pesticides found in the highest amounts included chlorpyrifos, methyl parathion and DDT.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'parathion'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of parathion
para- + thiophosphate + 1-on
First Known Use: 1947
Medical Definition of parathion
: an extremely toxic thiophosphate insecticide C10H14NO5PS
Learn More about parathion
Britannica.com: Encyclopedia article about parathion
Seen and Heard
What made you want to look up parathion? Please tell us where you read or heard it (including the quote, if possible).